Audio-Frequency Induction Loops (AFILs) as a Design Material for Architectural Interactivity: An Illustrated Guide

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Audio-frequency induction loops (AFILs) are commonly used as an assistive listening technology for hard-of-hearing individuals. They generate an electromagnetic field proportional to a sound source receivable by hearing aids. Our interactive system, the Sound of Space, is based on AFILs that generate a multi-dimensional soundscape in space. Cochlear implant (CI) listeners and hearing-aids wearers can experience the soundscape through bodily movement, whereas hearing individuals can experience it via a corresponding tangible device. While typical AFIL installations transmit a single sound source, in our interactive system we implement overlapping loops and their interference to locate multiple synchronised audio sources (i.e., corresponding electromagnetic fields) in space. The designed system is installed permanently in an integrative school for deaf, hard-of-hearing and hearing students and teachers. In this pictorial, we illustrate our design and implementation process and contribute our learnings of using AFILs as a design material for architectural interactivity.